<html>
  <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
  <style>
    .container:{
      display: flex;
      justify-content: center;
      align-items: center;
      width: 300;
      height: 300;
    }
  </style>
  <body>
    <div class="container">
      <div id="situation-container">
        工作计时
      </div>
      <div id="timer-container">
        00:00
      </div>
    </div>
   
   
  </body>
  <script src="./renderer.js"></script>
  
</html>